2MLG

Stf76 from the Sulfolobus islandicus plasmid-virus pSSVx

• PDB DOI:  https://doi.org/10.2210/pdb2MLG/pdb
• BMRB: 19821

• Classification: DNA BINDING PROTEIN
• Organism(s): Fuselloviridae
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2014-02-27 Released: 2014-03-12 
• Deposition Author(s): Farina, B., Russo, L., Fattorusso, R.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 3000 
• Conformers Submitted: 20 
• Selection Criteria: structures with the lowest energy 

Literature

Structural and functional studies of Stf76 from the Sulfolobus islandicus plasmid-virus pSSVx: a novel peculiar member of the winged helix-turn-helix transcription factor family.

Contursi, P., Farina, B., Pirone, L., Fusco, S., Russo, L., Bartolucci, S., Fattorusso, R., Pedone, E.

(2014) Nucleic Acids Res 42: 5993-6011

• PubMed: 24682827 
• DOI: https://doi.org/10.1093/nar/gku215
• Primary Citation of Related Structures:  
  2MLG


• PubMed Abstract: 
  

The hybrid plasmid-virus pSSVx from Sulfolobus islandicus presents an open reading frame encoding a 76 amino acid protein, namely Stf76, that does not show significant sequence homology with any protein with known 3D structure. The recombinant protein recognizes specifically two DNA-binding sites located in its own promoter, thus suggesting an auto-regulated role of its expression. Circular dichroism, spectrofluorimetric, light scattering and isothermal titration calorimetry experiments indicated a 2:1 molar ratio (protein:DNA) upon binding to the DNA target containing a single site. Furthermore, the solution structure of Stf76, determined by nuclear magnetic resonance (NMR) using chemical shift Rosetta software, has shown that the protein assumes a winged helix-turn-helix fold. NMR chemical shift perturbation analysis has been performed for the identification of the residues responsible for DNA interaction. In addition, a model of the Stf76-DNA complex has been built using as template a structurally related homolog.

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Organizational Affiliation: 

Interuniversity Centre for Research on Bioactive Peptides (CIRPEB), University of Naples Federico II, Via Mezzocannone 16, 80134 Naples, Italy Istituto di Biostrutture e Bioimmagini, C.N.R., Napoli 80134, Italy [e-mail].

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 10.31 kDa 
• Atom Count: 657 
• Modelled Residue Count: 77 
• Deposited Residue Count: 84 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Sulfolobus transcription factor 76 aminoacid protein, Stf76	A	84	Fuselloviridae	Mutation(s): 0
UniProt
Find proteins for O05472 (Sulfolobus islandicus) Explore O05472  Go to UniProtKB:  O05472

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 3000 
• Conformers Submitted: 20 
• Selection Criteria: structures with the lowest energy 

Structure Validation

Entry History 

Deposition Data

• Released Date: 2014-03-12 
Deposition Author(s): Farina, B., Russo, L., Fattorusso, R.

Revision History  

• Version 1.0: 2014-03-12
  Type: Initial release
  
• Version 1.1: 2014-06-04
  Changes: Database references